1. Institute of Research and Innovation, 1201 Takada, Kashiwa, Chiba 277-0861, Japan, Nanotubulites Project, JST-ICORP, c/o NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, NEC Corporation, 34 Miyukigaoka, Tsukuba, Ibaraki 305-8501, Japan, and Meijo University, Department of Physics, Tenpaku-ku, Nagoya 468-8502, Japan